集合中的元素不能强制类型转换???急!

sunrise10 2003-12-12 11:31:16

Cow类,Chicken类,继承类Animal

Animal[] animalArray=new Animal[2];
Cow myCow1=new Cow("Deirdre");
animalArray[0]=myCow1;
animalArray[1]= new Chicken("Ken");
foreach(Animal myAnimal in animalArray)
{
Console.WriteLine("New{0} object added to Array collection," +
"Name={1}",myAnimal.ToString(),myAnimal.Name);
}
数组中转换成功

ArrayList animalArrayList=new ArrayList();
Cow myCow2=new Cow("Hayley");
animalArrayList.Add("myCow2");
animalArrayList.Add(new Chicken("Roy"));
foreach(Animal myAnimal in animalArrayList)
{
Console.WriteLine("New{0} object added to Array collection," +
"Name={1}",myAnimal.ToString(),myAnimal.Name);
}
集合中出现类型转换不成功错误

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sunrise10 2003-12-12

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嘿嘿,谢了

brightheroes 2003-12-12

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这是个笔误，呵呵
楼主的方法是没有任何问题的^_^

brightheroes 2003-12-12

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see here

animalArrayList.Add("myCow2"); --- add a string into arraylist
animalArrayList.Add(new Chicken("Roy")); --- and a chicken into arraylist

---->

animalArrayList.Add(myCow2); --- add a cow into arraylist
animalArrayList.Add(new Chicken("Roy"));

that is ok

FileNewExit 2003-12-12

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try :

foreach(object ob in animalArrayList)
{
Animal myAnilmal = (Animal)ob;
Console.WriteLine("New{0} object added to Array collection," +
"Name={1}",myAnimal.ToString(),myAnimal.Name);
}